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Bronze Plating

Electroplating & electroless plating · Electrolytic bath

Bronze plating deposits a copper-tin or related copper alloy for warm decorative color, antiquing, or selected functional bearing surfaces.

CNC machiningSheet metalCastingPremium cost $$$Conductive
Request Bronze plate on a partCompare electroplating & electroless plating

Reference page — Bronze plate is not in the instant-quote configurator. Upload the part, name the finish in the notes, and an engineer quotes it with the part.

Bronze Plating on a machined part

What is Bronze plate?

Decorative systems normally use an underplate and clearcoat.

How it works

The activated workpiece is cathodically plated from an electrolyte containing copper and tin, or a qualified multi-metal white-bronze chemistry. Alloy ratio, additives, and current density control color and hardness. Copper or nickel underlayers provide leveling and corrosion resistance. Recesses plate more slowly than edges, and decorative bronze is commonly brushed or antiqued before sealing with lacquer. Functional bearing bronze uses different bath control, composition, thickness, and acceptance criteria from this decorative finish.

Why specify it

  • Warm metallic bronze appearance
  • Typical 2–10 µm decorative deposit
  • Can be antiqued and brushed
  • Some white-bronze systems replace nickel in decorative stacks

Where it falls short

  • Alloy and color are process specific
  • Bare bronze tarnishes
  • Thin decorative deposits are not bearing overlays
  • Recess color may differ from edges

Bronze plate at a glance

Bronze plate is strongest on cosmetic quality (88 of 100), at a premium cost.

Corrosion protectionFair40 / 100
Surface hardnessFair49 / 100
Cosmetic qualityExcellent88 / 100
LubricityLow32 / 100
Relative costPremium52 / 100
CorrosionHardnessCosmeticLubricityEconomy

Each score is 0–100 against every finish in this catalog. Corrosion comes from salt-spray life (ASTM B117, log scale) and hardness from the finish layer's Vickers or pencil hardness; cosmetic, lubricity and cost are FabDigit's engineering assessment. Economy on the radar is the inverse of cost.

Bronze plate key numbers

Typical values from the governing specifications and shop practice; bars are this finish against the highest value among electroplating & electroless plating finishes.

Thickness2–10 µm0.08–0.39 mil
Hardness120–350 HV
Thickness
2–5 µm for decorative bronze; up to 10 µm for antiqued or heavier coverage
Hardness
120–350 HV — Strongly dependent on copper-tin ratio and proprietary alloy.
Electrical
Conductive
Colours
  • red bronze
  • brown bronze
  • white bronze
  • antique bronze
Appearance
Warm red-brown to pale white bronze, bright, satin, or antiqued.

Where Bronze plate sits among all finishes

Surface hardness (Vickers, log scale) against corrosion protection (salt-spray hours, log scale) for every coating FabDigit offers, one cloud per finish group. Bronze plate is highlighted; hover a dot for its name or open the full map.

02550751000255075100Corrosion protection (0–100)Surface hardness (HV, log scale, 0–100)Plating — 19 finishesHard coatings — 17 finishesAnodize & conversion — 8 finishesPaint & powder — 7 finisheshard, low corrosion protectionhard and protectiveprotective, softsoft, little protectionType II anodize — corrosion 71, hardness 54BSA anodize — corrosion 71, hardness 52Type I anodize — corrosion 71, hardness 49Hard anodize — corrosion 71, hardness 61PTFE hard anodize — corrosion 71, hardness 61Nitriding — corrosion 55, hardness 73PEO — corrosion 70, hardness 74Sherardizing — corrosion 83, hardness 56Brass plate — corrosion 35, hardness 44Cadmium plate — corrosion 70, hardness 26Copper plate — corrosion 32, hardness 39Decorative chrome — corrosion 64, hardness 71Electroless copper — corrosion 20, hardness 41Electroless nickel — corrosion 70, hardness 68Nickel plate — corrosion 51, hardness 55Gold plate — corrosion 68, hardness 39Hard chrome — corrosion 40, hardness 73Hot-dip zinc — corrosion 90, hardness 42Nickel-PTFE — corrosion 72, hardness 57Silver plate — corrosion 55, hardness 39Solder plate — corrosion 42, hardness 9Tin plate — corrosion 34, hardness 0Zinc plate — corrosion 60, hardness 30Zinc-nickel — corrosion 86, hardness 60Cerakote — corrosion 83, hardness 27E-coat — corrosion 83, hardness 15Epoxy coat — corrosion 83, hardness 15Powder coat — corrosion 83, hardness 14Wet paint — corrosion 59, hardness 10AlCrN PVD — corrosion 58, hardness 93AlTiN PVD — corrosion 52, hardness 94CrN PVD — corrosion 62, hardness 83DLC — corrosion 55, hardness 93MoS2 PVD — corrosion 20, hardness 26TiAlN PVD — corrosion 50, hardness 93TiCN PVD — corrosion 40, hardness 92TiB2 PVD — corrosion 40, hardness 94TiN PVD — corrosion 45, hardness 87WC/C PVD — corrosion 48, hardness 77ZrN PVD — corrosion 52, hardness 90CVD alumina — corrosion 70, hardness 85CVD TiCN — corrosion 38, hardness 92CVD TiN — corrosion 45, hardness 87Multilayer CVD — corrosion 62, hardness 88HVOF coating — corrosion 78, hardness 77Plasma spray — corrosion 60, hardness 68Plastic chrome — corrosion 72, hardness 71Electroless plastic — corrosion 58, hardness 39Clear coat — corrosion 20, hardness 12Soft-touch — corrosion 20, hardness 5PLATINGHARD COATINGSANODIZE & CONVERSIONPAINT & POWDERBrass plateNickel plateType II anodizePowder coatZinc plateZinc-nickelHard chromeDLCTiN PVDTin plateCadmium plateE-coatCerakoteWet paintHot-dip zincNitridingHVOF coatingBronze plate — corrosion 40, hardness 49Bronze plate
02550751000255075100Corrosion protection (0–100)Surface hardness (HV, log scale, 0–100)Plating — 19 finishesHard coatings — 17 finishesAnodize & conversion — 8 finishesPaint & powder — 7 finishesType II anodize — corrosion 71, hardness 54BSA anodize — corrosion 71, hardness 52Type I anodize — corrosion 71, hardness 49Hard anodize — corrosion 71, hardness 61PTFE hard anodize — corrosion 71, hardness 61Nitriding — corrosion 55, hardness 73PEO — corrosion 70, hardness 74Sherardizing — corrosion 83, hardness 56Brass plate — corrosion 35, hardness 44Cadmium plate — corrosion 70, hardness 26Copper plate — corrosion 32, hardness 39Decorative chrome — corrosion 64, hardness 71Electroless copper — corrosion 20, hardness 41Electroless nickel — corrosion 70, hardness 68Nickel plate — corrosion 51, hardness 55Gold plate — corrosion 68, hardness 39Hard chrome — corrosion 40, hardness 73Hot-dip zinc — corrosion 90, hardness 42Nickel-PTFE — corrosion 72, hardness 57Silver plate — corrosion 55, hardness 39Solder plate — corrosion 42, hardness 9Tin plate — corrosion 34, hardness 0Zinc plate — corrosion 60, hardness 30Zinc-nickel — corrosion 86, hardness 60Cerakote — corrosion 83, hardness 27E-coat — corrosion 83, hardness 15Epoxy coat — corrosion 83, hardness 15Powder coat — corrosion 83, hardness 14Wet paint — corrosion 59, hardness 10AlCrN PVD — corrosion 58, hardness 93AlTiN PVD — corrosion 52, hardness 94CrN PVD — corrosion 62, hardness 83DLC — corrosion 55, hardness 93MoS2 PVD — corrosion 20, hardness 26TiAlN PVD — corrosion 50, hardness 93TiCN PVD — corrosion 40, hardness 92TiB2 PVD — corrosion 40, hardness 94TiN PVD — corrosion 45, hardness 87WC/C PVD — corrosion 48, hardness 77ZrN PVD — corrosion 52, hardness 90CVD alumina — corrosion 70, hardness 85CVD TiCN — corrosion 38, hardness 92CVD TiN — corrosion 45, hardness 87Multilayer CVD — corrosion 62, hardness 88HVOF coating — corrosion 78, hardness 77Plasma spray — corrosion 60, hardness 68Plastic chrome — corrosion 72, hardness 71Electroless plastic — corrosion 58, hardness 39Clear coat — corrosion 20, hardness 12Soft-touch — corrosion 20, hardness 5PLATINGHARD COATINGSANODIZE & CONVERSIONPAINT & POWDERBrass plateNickel platePowder coatZinc plateBronze plate — corrosion 40, hardness 49Bronze plate
Anodize & conversionPlatingPaint & powderHard coatings

Specifications for Bronze plate

The documents a drawing cites to define this finish, with the Type / Class rows that apply. Each links to a page explaining the standard.

Drawing call-out

TIN-BRONZE PLATE, 5 µm MIN OVER 10 µm MIN COPPER UNDERPLATE; SATIN ANTIQUE-BRONZE COLOR TO APPROVED SAMPLE; CLEAR LACQUER

Which materials take Bronze plate?

Verdict per material family, with the grades that behave differently. Each family links to its datasheets in the material library.

Material familyVerdictNotes
Brass
YesCommon decorative and electrical substrate after cleaning.
Copper Alloy
YesCompatible decorative substrate.
Steel
YesUse copper/nickel underplate.
Aluminum
With careRequires zincate and underplating.
DMLS / SLM
With careMetal AM parts can be plated after density, powder, and porosity review.
Stainless Steel
With careNeeds activation and a nickel or other strike over the passive film.
Zinc Alloy
With careRequires strike and leveling layers.
Magnesium Alloy
LimitedHighly reactive; needs a qualified pretreatment and is rarely plated this way.
Polymer
LimitedOnly plateable resins after etch, catalyst, and electroless metallization.
SLA
LimitedOnly if the resin is qualified for metallization; most SLA parts are not.
Titanium
LimitedPossible only with specialized activation; not a routine job-shop sequence.
FDM
NoFused-filament polymers are not a standard plating substrate.
MJF
NoPorous nylon powder-bed parts are not a standard plating substrate.
SLS
NoPorous nylon powder-bed parts are not a standard plating substrate.

How Bronze plate is applied, and what it does to the part

  1. 1Polish
  2. 2Clean
  3. 3Underplate
  4. 4Bronze alloy plate
  5. 5Rinse
  6. 6Brush or antique
  7. 7Clearcoat
  8. 8Color inspection
DimensionsInclude underplate and clearcoat in total buildup; 2–10 µm refers only to the decorative bronze layer.
Build-up per side7–25 µm — Includes typical underplate plus bronze; functional bearing bronze uses a different thickness regime.
MaskingUsually needed. Mask precision interfaces, electrical contacts under lacquer, and visible rack-contact zones.
ElectricalConductive
AppearanceWarm red-brown to pale white bronze, bright, satin, or antiqued.
Added lead time5–10 working days on top of the bare part

Design rules for Bronze plate

What to decide on the drawing before the part goes to the finisher.

  1. Identify alloy family.Tin-bronze and white-bronze deposits are not interchangeable.
  2. Approve color and texture samples.Alloy ratio and antiquing control the visual result.
  3. Specify underplate and clearcoat.They control leveling, corrosion, tarnish, and skin contact.
  4. Do not use decorative data for bearings.Functional bearing overlays require separate composition and thickness engineering.

Bronze plate versus the alternatives

Finishes engineers weigh against Bronze plate, and when each wins.

FinishCorrosionHardnessCosmeticCostThicknessChoose it when
Bronze plate
this page
404988$$$2–10 µm—
Brass Plating
Bronze plate vs Brass Plating →
354488$$$2–10 µmwhen a brighter yellow-gold appearance is wanted
Electrolytic Nickel Plating
Bronze plate vs Electrolytic Nickel Plating →
515578$$5–25 µmwhen a standard silver barrier finish is required
CorrosionHardnessCosmeticLubricityEconomy
Bronze plateBrass Plating

The radar overlays Bronze plate with Brass Plating, its most common alternative — chosen when a brighter yellow-gold appearance is wanted. Scores in the table are 0–100 across every finish in the catalog.

Cost, lead time and compliance

Relative cost

Bronze Plating is a premium-cost finish ($$$): more expensive than about 58 % of the finishes FabDigit quotes.

Finishing is priced per part with a lot minimum, from FabDigit's own China-side rates. The exact figure appears on the instant quote once the part is uploaded.

Lead time and compliance

Added lead time5–10 working days
RoHSCompliant
NotesVerify alloy constituents and clearcoat; do not assume every white-bronze process is nickel-free or allergen compliant.

What Bronze plate is used for

  • Architectural hardware
  • Lighting fixtures
  • Decorative controls
  • Furniture trim

Bronze plate — frequently asked

what is bronze plating

Bronze plating usually electrodeposits a copper-tin alloy in a 2–10 µm decorative layer. It is commonly applied over copper or nickel and sealed against tarnish.

bronze plating vs brass plating

Bronze is generally copper-tin and gives a red-brown or pale white tone. Brass is copper-zinc and gives a brighter yellow color; both usually need a clearcoat.

does bronze plating tarnish

Yes, unsealed copper-alloy deposits oxidize and darken. Decorative parts are commonly lacquered after brushing or antiquing.

can bronze plate steel

Yes, after cleaning and a copper or nickel underplate. The 2–10 µm bronze layer alone should not be treated as the steel corrosion barrier.

is white bronze nickel free

Some proprietary copper-tin-zinc white-bronze systems are marketed as nickel-free, but composition is process specific. Obtain a supplier declaration rather than infer compliance from color.